The seatmap appears to show only downstairs seats, but in fact, if you look closely you'll see several rows all together which are in a 2x2 configuration. Those are the upstairs seats. Off the top of my head, they're rows 11-17/18, depending on the side of the aircraft you're on. My personal recommendation is 15H, followed by 15A and then 16B. Hope one of those seats is open for you!

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